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Ha.140
Seaplane - Torpedo Bomber
Blohm und Voss
 The first prototype Hа.140-V1 (D-AUTO) flew on September 30, 1937. - a month after its main competitor - He.115 .
1 and V2 did not differ significantly. Both were powered by VMW-132K engines with a takeoff power of 800 hp. and a capacity of 830 hp. at an altitude of 1000 m. All-metal construction. A cantilever wing with one tubular spar, the central part of which was divided into five fuel tanks. The central tank with a smaller capacity was reserved. Fuselage-monocoque with a set of frames and stringers, the main partitions of a rigid box-shaped structure. Two all-metal floats were attached to steel struts to the ends of the center section of the main spar. Wagner's beams went along most of the float. The float consisted of eight compartments. The alleged armament included a MG-15 machine gun in a bow mount, which had small angles of fire due to its placement under a squat cap. The radio operator had the same machine gun under a movable canopy on the fuselage. The internal suspension could accommodate a torpedo or four 250-kg bombs. The crew consisted of three people.
Work on the third prototype Hа.140-VЗ (D-AMME) dragged on until the end of 1938. The aircraft was distinguished by slotted slats along the entire wing console, a reinforced structure and the absence of a front machine gun turret. He arrived in Travemunde on May 11, 1939, when the department had already selected the He.115 as fully satisfying the assignment. Work on the Hа.140 went only as a duplication of the main program. Although the flight characteristics of both aircraft were similar, the He.115 had better controllability on the water and good course stability, and the flight and seaworthiness characteristics of the Ha.140 were lower than desired. On September 21, 1939, the Hа.140 program was terminated.
The Ha.140-V3 was returned to Blom und Foss for use as a flying laboratory. At the end of 1939, a reduced model of the keel BV.222, mounted on the fuselage, was tested on the aircraft. During 1940 the same aircraft was redesigned again, this time under a variable geometry wing. It was planned for the transport BV.144 by order of Lufthansa. The Vogt tubular spar proved to be very convenient for installing the hinge, and on the Hа 140-V3 the wing consoles could be deflected by 6 ° using an electric drive. No test results for a variable sweep wing are known.
Armament . One 7.9-mm machine gun MG-15 under the nose cap and the same one under the movable lantern of the gunner-radio operator, 1 × 950 -kg torpedo or 4 × 250-kg bombs.
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